Add setMaxBytesLocalDisk support for Ehcache 2 (support/ehcache2)

[Copilot]

setMaxBytesLocalDisk was absent from the Ehcache 2 AbstractEhcacheCache, causing MyBatis to silently ignore <property name="maxBytesLocalDisk"/> configuration — disk usage grew without bound.

Ehcache 2 throws IllegalStateException: A Cache can't switch disk pool! when enabling the byte-based disk pool on a running cache, so a direct setter is not viable.

Changes

• AbstractEhcacheCache — adds setMaxBytesLocalDisk(long): snapshots TTI/TTL/heap/eviction-policy into a fresh CacheConfiguration with the byte limit applied, then replaces the live cache via CacheManager. Adds rebuildCacheWith(CacheConfiguration) as a protected template method for subclass extension.
• EhBlockingCache — overrides rebuildCacheWith to re-wrap the replacement cache in a BlockingCache decorator, preserving per-key locking semantics post-rebuild.
• EhcacheTest — shouldSetMaxBytesLocalDisk verifies config is applied and cache remains functional; shouldSupportDiskOverflow sets heap=1, disk=10 MB, writes 3 entries, and asserts all 3 are retrievable (proving the disk tier is live after rebuild).
• EhBlockingCacheTest — mirrors both tests for the blocking-cache path, confirming the BlockingCache decorator survives the rebuild.

// Before: silently ignored, disk grows without bound
// After:
cache.setMaxEntriesLocalHeap(1);
cache.setMaxBytesLocalDisk(10 * 1024 * 1024L); // triggers rebuild with disk tier
cache.putObject("key1", "value1");
cache.putObject("key2", "value2"); // key1 overflows to disk
cache.putObject("key3", "value3");
assertEquals("value1", cache.getObject("key1")); // retrievable from disk
assertEquals("value2", cache.getObject("key2")); // retrievable from disk
assertEquals("value3", cache.getObject("key3"));

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[coveralls]

coverage: 82.222% (+5.4%) from 76.812%
when pulling 1eaa43d on copilot/refactor-ehcache2-fix
into 1bd0e7b on support/ehcache2.